修复一个奇怪的bug

pom.xml

@@ -56,14 +56,8 @@
 				<configuration>
 					<source>1.7</source>
 					<target>1.7</target>
+					<encoding>${project.build.sourceEncoding}</encoding>
 				</configuration>
-				<dependencies>
-					<dependency>
-						<groupId>org.codehaus.plexus</groupId>
-						<artifactId>plexus-compiler-javac</artifactId>
-						<version>2.5</version>
-					</dependency>
-				</dependencies>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>

weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/HttpComponent3Factory.java

@@ -13,6 +13,11 @@ import org.apache.commons.httpclient.HttpClient;
  */
 public class HttpComponent3Factory extends HttpClientFactory {
 
+	public HttpComponent3Factory() {
+		// odd bug
+		Class _ = HttpClient.class;
+	}
+
 	@Override
 	public com.foxinmy.weixin4j.http.HttpClient newInstance() {
 		return new HttpComponent3(new HttpClient());

weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/HttpComponent4Factory.java

@@ -15,10 +15,15 @@ import com.foxinmy.weixin4j.http.HttpClient;
  */
 public class HttpComponent4Factory extends HttpClientFactory {
 	
+	private final VersionInfo version;
+
+	public HttpComponent4Factory() {
+		version = VersionInfo.loadVersionInfo("org.apache.http.client",
+				HttpClient.class.getClassLoader());
+	}
+
 	@Override
 	public HttpClient newInstance() {
-		VersionInfo version = VersionInfo.loadVersionInfo(
-				"org.apache.http.client", HttpClient.class.getClassLoader());
 		String release = (version != null) ? version.getRelease()
 				: VersionInfo.UNAVAILABLE;
 		if (release.startsWith("4.")) {